.thumbnail-field { margin-top: 16px; padding-top: 12px; border-top: 1px solid #8993a144; }
.thumbnail-field p { font-size: 12px; line-height: 1.6; }
.thumbnail-field-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.thumbnail-field button, .thumbnail-dialog button { padding: 8px 12px; border: 1px solid #8993a1; border-radius: 6px; cursor: pointer; background: transparent; color: inherit; font: inherit; font-size: 13px; }
.thumbnail-dialog { box-sizing: border-box; width: min(560px, calc(100vw - 24px)); max-height: calc(100dvh - 24px); padding: 0; border: 1px solid #8993a1; border-radius: 12px; background: #fff; color: #25282d; overflow: hidden; }
.thumbnail-dialog[open] { display: flex; flex-direction: column; }
.thumbnail-dialog::backdrop { background: #0009; }
.thumbnail-dialog-body { padding: 16px; overflow-y: auto; min-height: 0; }
.thumbnail-dialog h2 { font-size: 18px; margin: 0 0 12px; }
.thumbnail-dialog p { font-size: 12px; line-height: 1.6; }
.thumbnail-picker { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; }
.thumbnail-picker label { flex: 1 1 220px; }
.thumbnail-dialog label { display: block; font-size: 13px; }
.thumbnail-dialog input[type=url] { box-sizing: border-box; width: 100%; min-width: 0; padding: 9px; border-radius: 6px; border: 1px solid #8993a1; background: transparent; color: inherit; }
.thumbnail-dialog canvas { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; background: #e6e9ed; cursor: grab; touch-action: none; border-radius: 6px 6px 0 0; }
.thumbnail-dialog canvas:active { cursor: grabbing; }
.thumbnail-dialog input[type=range] { width: 100%; margin: 12px 0; }
.thumbnail-dialog-footer { flex: none; display: flex; justify-content: end; gap: 8px; padding: 12px; border-top: 1px solid #8993a144; background: inherit; }
.thumbnail-dialog [data-use] { background: #d9000c; color: white; border-color: #d9000c; }
.thumbnail-dialog [data-error] { color: #c23232; }
.thumbnail-dialog button:disabled { opacity: .5; cursor: default; }
body.watch-panel .thumbnail-dialog, body.is-extension-panel .thumbnail-dialog { background: #1c2026; color: #f3f4f6; }
@media (prefers-color-scheme: dark) { .thumbnail-dialog { background: #1c2026; color: #f3f4f6; } .thumbnail-dialog [data-error] { color: #ff9292; } }